JPH05261437A - Metallic bar with mark - Google Patents

Abstract

PURPOSE:To obtain the long-sized material which facilitates mechanical detection and is adequate as a blank material for various kinds of parts by previously mechanically or chemically forming a mark on the surface of a metallic bar, then subjecting the metallic bar to a surface treatment, such as plating. CONSTITUTION:The mark 12 which is easily detectable with an optical detector or the like is formed by the mechanical or chemical method on the surface of a base material 11 of the long-sized metallic bar and thereafter, a surface treated layer 13 is formed by plating, etc., thereon. Since this mark 12 is covered by the surface treated layer 13, such as plating, formed on the front surface side, the formation of rust, etc., or peeling around this mark 12 does not arise at all. This base material worked as a blank material to individual pieces, by which electrical or mechanical parts are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal strip, and more particularly to a metal strip used as a material for forming electronic parts and mechanical parts.

[0002]

2. Description of the Related Art For example, in order to form an electronic component, a semiconductor element called a chip is mounted on a lead frame which is a series of leads forming an internal conductor circuit, and a part of each lead is projected. In this state, almost the whole is resin-sealed. A lead frame for forming such an electronic component is continuously formed by using a long metal as a material so that it can be formed by a so-called reel-to-reel. It is an individual piece for electronic parts. In addition, for such a long metal material, that is, a metal strip, in order to secure finger-stretching resistance, corrosion resistance, adhesion, etc., depending on the object to be used or the conditions, Various surface treatments such as plating are applied. As this surface treatment, in addition to the above-mentioned one,
This is done in response to various demands such as the purpose of decoration to make the surface beautiful and the solderability improved, or the contact resistance improved.

Further, when the metal strips as described above are formed into individual pieces, it goes without saying that they are completely indistinguishable. However, some products formed from such metal strips use multiple types even if they have the same shape.In such a case, the individual pieces cut from each metal strip are used. Pieces must be distinguished by some method. In particular, it is often the case that the surface treatment represented by plating is indistinguishable from the outside. Moreover, for example, if an optical sensor is used to mechanically select individual pieces while distinguishing them, the work becomes extremely difficult.

Therefore, in the conventional manufacture of electronic parts and the like, when a metal strip is pressed into predetermined individual pieces, a mark is directly attached to the surface of the metal strip by the pressing machine. It was done. However, doing this also damages the surface treatment layer such as plating formed by bending the metal strip, and is advantageous in that parts can be distinguished by the marks. However, there is a problem that rust occurs mainly on the scratch caused by forming the mark, or the plating peels off due to the scratch, which becomes dust and adversely affects the completed electronic component. It was happening.

Therefore, the inventors of the present invention should form a metal strip which does not impair its original function as a material for electronic parts and the like, and can be mechanically sorted when it is made into individual pieces. The present invention has been completed as a result of various studies as to what should be done.

[0006]

The present invention has been made based on the above-described background, and the problem to be solved is the distinction of metal strips when formed into individual pieces.

An object of the present invention is to facilitate mechanical detection by a mark formed on a strip base material constituting a metal strip before the surface treatment thereof. It is to provide a metal strip that does not adversely affect the product when it is manufactured.

[0008]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention will be described with reference to the reference numerals used in the embodiments. Used as a long material for the strip base material 1
1 is a metal strip that has been subjected to a predetermined surface treatment, and a strip base material 1
1. A mark 12 preliminarily provided by mechanically or chemically processing 1 on part 1 and a surface treatment layer 1 such as plating on the strip base material 11 including the mark 12
3 is a metal strip 10 with a mark.

That is, the metal strip 10 is formed by forming a mark 12 on a strip base material 11 and then forming a surface treatment layer 13 such as plating on the surface of a necessary portion. The mark 12 is a surface treatment layer. It is covered by 13.

[0010]

The metal strip 10 constructed as described above is processed into a predetermined individual piece before manufacturing an electronic component or a mechanical component. It is not necessary to add a mark at the time of press working as in the above. This is because the mark 12 has already been formed on the metal strip 10. Therefore, when the metal strip 10 is used, the working operation can be simplified.

Further, even if the metal strip 10 is formed into individual pieces to form electronic parts and the like, since the marks 12 are formed continuously on the metal strip 10, all the individual pieces are formed into marks. As a matter of course, since the mark 12 is provided, since the mark 12 is partially formed, that is, in a portion that does not interfere with the formation of the electronic component or the like, there is no problem in forming the electronic component or the like. Will never come. The continuity of the marks 12 can be maintained by reducing the interval between the dots 12 not only when the marks 12 are formed as a line but also when formed as dots.

Further, in the metal strip 10, since the mark 12 is covered with the surface treatment layer 13 such as plating formed on the surface side, the mark 12 is formed mechanically or chemically. However, rust or the like is not generated around the mark 12 or the surface treatment layer 13 on the surface side thereof is not peeled off at all. Of course, the mark 1 on the metal strip 10
In No. 2, even if the surface treatment layer 13 is formed on the surface, the surface is not flattened by this, and for example, the diffuse reflection of the light of the optical sensor can be sufficiently performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the metal strip 10 according to the present invention will be described in detail according to the embodiment shown in the drawings together with the manufacturing method thereof.

In order to manufacture the metal strip 10, it is necessary to use a long strip base material 11. The reason for this is that this type of metal strip 10 is used in a reel-to-reel manner while continuously undergoing various processing,
This is because it is finally necessary to use a material for forming electronic parts and the like. The material of the strip base material 11 is determined according to the electronic component or the like as the final product, but copper, copper alloys such as titanium copper, nickel, stainless steel,
For example, nickel alloy such as 42 alloy or other metal material is adopted.

Then, as shown in FIG. 4, such a strip base material 11 is subjected to a reel-to-reel operation.
The metal strip 10 is formed by continuous processing.
For that purpose, for example, a groove to be the mark 12 is formed in the strip base material 11 by the diamond indenter 14, and then the predetermined surface treatment layer 13 is formed by the surface treatment apparatus. What is important here is that the mark 12 is formed at a predetermined position on the strip base material 11 before the surface treatment layer 13 is formed on the strip base material 11 by the surface treatment apparatus. This is because if the mark 12 is formed after the surface treatment layer 13 is formed on the strip base material 11, the mark 12 cannot be protected by the surface treatment layer 13.

The mark 12 shown in FIG. 4 has a linear shape by pressing the diamond indenter 14 against the strip base material 11 at a predetermined pressure.
The mark 12 may be formed in a dotted line by changing the shape of 4 and the method of pressure contact. The position where the mark 12 is formed on the strip base material 11 varies depending on the condition of the electronic component or the like formed by using the metal strip 10 as a material. For example, a lead frame including a large number of leads by the metal strip 10. If it is formed, it may be formed in a tie bar portion for connecting each lead.

In the present embodiment, the mark 12 is formed by the diamond indenter 14, but the diamond indenter 14 may be replaced by one using iron or cemented carbide. .. Further, the angle of the bottom of the mark 12 is optimally about 140 degrees when it can be sensed by an optical sensor, and it is preferable to use such a diamond indenter 14. Further, if the strip base material 11 has a space, the mark 12 may be formed by a chemical means such as etching, and in this case, the strip-shaped mark 1 may be formed.
By setting the number to 2, the detection by the optical sensor shown in FIG. 5 can be easily performed.

As the surface treatment layer 13, a plating layer is basically preferable, and specifically, bright tin plating, bright solder plating, copper plating, bright nickel plating, gold plating or the like is adopted.

The metal strip 10 formed as described above is
As shown in FIG. 3, the metal strip 10 has the surface treatment layer 13 on the surface of the mark 12 formed on the strip base material 11, as shown in FIG. 1 or 2. The surface treatment layer 13 is formed, and the surface of the surface treatment layer 13 is marked with the mark 12.
Then, in the stage before being made into an electronic component, it is made into an individual piece as shown in FIG. 5, and this individual piece is made into an optical sensor etc. by the mark 12 protruding on the surface thereof. That kind of confirmation is made.

[0020]

As described above in detail, in the present invention,
As illustrated in the above embodiment, "a long base material 11 is used as a long material for forming electronic parts and mechanical parts.
A metal strip having a predetermined surface treatment applied to the strip base material 11
Mark 12 preliminarily formed by partially or continuously subjecting the metal to mechanical or chemical processing, and a surface treatment layer 13 such as plating applied on the strip base material 11 including the mark 12
"Is provided" has a characteristic in its construction, which enables the mechanical detection to be easily performed by the mark formed on the strip base material forming the metal strip before the surface treatment. In addition to the above, it is possible to provide a metal strip that does not have an adverse effect when it is made into a product.

[Brief description of drawings]

1 is a partial front view of a metal strip according to the present invention.

FIG. 2 is a partial front view showing another embodiment of the same metal strip.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIGS. 1 and 2.

FIG. 4 is a partial front view schematically showing a manufacturing process of a metal strip according to the present invention.

FIG. 5 is a perspective view schematically showing a state where a metal strip according to the present invention is made into an individual piece and is detected by an optical sensor.

[Explanation of symbols]

 10 Metal Strip 11 Strip Base Material 12 Mark 13 Surface Treatment Layer 14 Diamond Indenter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsunori Tomita 1 Hirayama, Akasaka, Otowa-cho, Takai-gun, Aichi Prefecture Tokai Rika Electric Co., Ltd.

Claims (1)

[Claims] 1. A metal strip, which is used as a long material for forming electronic parts and mechanical parts, and which has a strip base material subjected to a predetermined surface treatment. The strip base material is mechanically or chemically formed. A metal strip with a mark, comprising a mark preliminarily applied by partially and continuously performing processing, and a surface treatment layer such as plating applied to the strip base material including the mark. ..